Thirteen-year-old Lucy Eberslee, the Gatekeeper's deputy at the end of the world, teams up with Arthur and Rosemary, who are from other worlds, to investigate why the doors between worlds are stuck.
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Electronic reproduction. New York : HarperCollins, 2019. Requires Adobe Digital Editions (file size: 5 KB) or Kobo app or compatible Kobo device (file size: N/A KB).